/* Copyright (c) 2015-2018 Dovecot authors, see the included COPYING file */

#ifndef PUSH_NOTIFICATION_DRIVERS_H
#define PUSH_NOTIFICATION_DRIVERS_H

#include "mail-user.h"
#include "push-notification-triggers.h"

struct mail_user;
struct push_notification_driver_txn;
struct push_notification_driver_user;
struct push_notification_txn_mbox;
struct push_notification_txn_msg;

HASH_TABLE_DEFINE_TYPE(push_notification_config, const char *, const char *);
HASH_TABLE_DEFINE_TYPE(push_notification_msgs, void *,
					   struct push_notification_txn_msg *);

struct push_notification_driver_vfuncs {
	/* Init driver. Config should be read from settings via the name
	   parameter. Return 0 on success, or -1 if this driver should be
	   disabled (or on error). */
	int (*init)(struct mail_user *user, pool_t pool, const char *name,
		    void **context, const char **error_r);
	/* Called at the beginning of a notification transaction. Return TRUE on
	   success, or FALSE if this driver should be ignored for this
	   transaction. */
	bool (*begin_txn)(struct push_notification_driver_txn *dtxn);
	/* Called once for every mailbox processed. */
	void (*process_mbox)(struct push_notification_driver_txn *dtxn,
			     struct push_notification_txn_mbox *mbox);
	/* Called once for every message processed. */
	void (*process_msg)(struct push_notification_driver_txn *dtxn,
			    struct push_notification_txn_msg *msg);
	/* Called at the end of a successful notification transaction. */
	void (*end_txn)(struct push_notification_driver_txn *dtxn,
			bool success);
	/* Called when plugin is deinitialized. */
	void (*deinit)(struct push_notification_driver_user *duser);
	/* Called to cleanup any global resources used in plugin. */
	void (*cleanup)(void);
};

struct push_notification_driver {
	const char *name;
	struct push_notification_driver_vfuncs v;
};

struct push_notification_driver_user {
	const struct push_notification_driver *driver;
	void *context;
};

struct push_notification_driver_txn {
	const struct push_notification_driver_user *duser;
	struct push_notification_txn *ptxn;

	/* Transaction context. */
	void *context;
};

struct push_notification_driver_list {
	ARRAY(struct push_notification_driver_user *) drivers;
};

struct push_notification_user {
	union mail_user_module_context module_ctx;
	struct push_notification_driver_list *driverlist;
};

struct push_notification_trigger_ctx {
	const char *name;
	void *context;
};

struct push_notification_txn {
	pool_t pool;

	struct mailbox *mbox;
	struct mail_user *muser;
	struct push_notification_user *puser;
	bool initialized;

	enum push_notification_event_trigger trigger;
	struct push_notification_trigger_ctx *trigger_ctx;
	ARRAY(struct push_notification_driver_txn *) drivers;
	ARRAY(struct push_notification_event_config *) events;

	struct event *event;

	/* Used with mailbox events. */
	struct push_notification_txn_mbox *mbox_txn;

	/* Used with mailbox events. */
	HASH_TABLE_TYPE(push_notification_msgs) messages;

	/* Private (used with message events). */
	struct mailbox_transaction_context *t;
};


int push_notification_driver_init(
	struct mail_user *user, const char *config_in, pool_t pool,
	struct push_notification_driver_user **duser_r);
void push_notification_driver_cleanup_all(void);

void ATTR_FORMAT(3, 4)
push_notification_driver_debug(const char *label, struct mail_user *user,
			       const char *fmt, ...);

void push_notification_driver_register(
	const struct push_notification_driver *driver);
void push_notification_driver_unregister(
	const struct push_notification_driver *driver);

#endif
